I was playing Sonic 3D blast DX (The guy who post this on the workshop is keep this up do to date) and I got to act 1 and this happened:
If your confused, then you are not the only one. That is the pink flickey with the lava colo(u)r plate. Also if you wondering, yes, this happened in act 2, no, I don't have screenshot of this in act 2.
Level Details:
Sonic 3d blast DX on steam via Sega classics workshop (Version 0.3), Level Volcano Valley act 1 & 2.
There are only a limited amount of colour palettes the Genesis can handle at the same time. This has been already showcased when Super Sonic yellowed Green Grove's water. Volcano Valley uses the most palettes in the game; the purple Flicky's palette just doesn't fit.